Legacy ImageMagick Discussions Archive

Code: Select all

HX_RESULT LogoOverlayManager::PrepareOverlay()
{
    HX_RESULT ret = HXR_OK;
    ExceptionInfo *exception;    
    ImageInfo *image_info2, *image_info3, *alpha_info;
     
    // initialize the image info structure
    MagickCoreGenesis(NULL,MagickTrue);
    exception=AcquireExceptionInfo();

    image_info2 = CloneImageInfo((ImageInfo *) NULL);
    image_info3 = CloneImageInfo((ImageInfo *) NULL);
    alpha_info = CloneImageInfo((ImageInfo *) NULL);


    // get the overlay image from a file or the overlayimage.h version
    if(m_pCompositeImageFilename.IsEmpty())
    {
	// overlayimage.h
	int imageSize =  sizeof(g_pOverlayImageBlob) / sizeof(UCHAR);
        m_pOverlayImage = BlobToImage(image_info2,g_pOverlayImageBlob, imageSize,exception);
    }
    else 
    {     
	// file
        (void) strcpy(image_info2->filename,m_pCompositeImageFilename); 
        m_pOverlayImage = ReadImage(image_info2,exception);
    }
    


    // no overlay image, fail
    if(m_pOverlayImage == NULL)
    {
        ret = HXR_FAIL;
    }
	
	
    // overlay image, succeed 
    if(SUCCEEDED(ret))
    {
	// get image info
        m_iCompositeImageWidth = m_pOverlayImage->magick_columns;
        m_iCompositeImageHeight = m_pOverlayImage->magick_rows;        
        m_pCompositeImageFormat = m_pOverlayImage->magick;

        // resize the image based on set scale percentage
        ret = ScaleOverlay();								

	// resize successful
        if(SUCCEEDED(ret))
        {
            int length = 0;	

			// if alpha channel exists, clone and convert alpha channel
			m_bAlphaChannelPresent = GetImageAlphaChannel(m_pOverlayImage);					
			if(m_bAlphaChannelPresent == MagickTrue && m_bEnableTransparency) 
			{
				// extract the alpha channel
				m_pAlphaImage = CloneImage(m_pOverlayImage, m_iCompositeImageWidth, m_iCompositeImageHeight, MagickFalse, exception);
				m_bAlphaChannelPresent = SetImageAlphaChannel(m_pAlphaImage, ExtractAlphaChannel);

			        // this is to overcome the behavior of Imagemagick. Without
			        // a filename, IM would not decompress the image even if we 
                                // ask it to write it to a blob(and not a file)
				(void) strcpy(alpha_info->filename,"alpha.yuv");
				m_pAlphaImageFormat = m_pAlphaImage->magick;

				// convert alpha image to YUV
				alpha_info->colorspace = YUVColorspace;
				m_pAlphaImageFormat = "YUV";
				strcpy(alpha_info->magick, m_pAlphaImageFormat);
				(void) TransformImageColorspace((Image *) m_pAlphaImage, YUVColorspace);
				m_pAlphaImageBlob = ImageToBlob(alpha_info,(Image *) m_pAlphaImage, (size_t*) &length , exception);

				if(m_pAlphaImageBlob == NULL)
				{
					return HXR_FAIL;
				}
			}
			else // make alpha NULL
			{
				m_pAlphaImage = NULL;
			} 

			// convert overlay image to YUV
            (void) strcpy(image_info3->filename,"foobar.yuv");			 
	    image_info3->colorspace = YUVColorspace; 
            m_pCompositeImageFormat = "YUV";      
            strcpy(image_info3->magick, m_pCompositeImageFormat);
            (void) TransformImageColorspace((Image *) m_pOverlayImage,YUVColorspace);
            m_pCompositeImageBlob = ImageToBlob(image_info3,(Image *) m_pOverlayImage, (size_t*) &length , exception);
            
			// no conversion, fail
            if(m_pCompositeImageBlob == NULL)
            {
                ret = HXR_FAIL;
            }
        }

    }

    HX_ASSERT(SUCCEEDED(ret));

    // clean up
    exception=DestroyExceptionInfo(exception);
    DestroyImageInfo(image_info2);
    DestroyImageInfo(image_info3);
    DestroyImageInfo(alpha_info);

    return ret;

}